Reflector for electric lamps

ABSTRACT

Reflector for electric lamps. The reflector comprises a part of aluminum plate of the shape of a truncate ball segment, and in connection with it a part of the shape of a paraboloid, and which is provided with one or several elastic fixing means for fixing the reflector detachably to the lamp-globe. One or several naillike projections are pressed into the reflector, through which one end of a spring serving as fixing means is brought, while the other end protrudes from the inside surface of the reflector, so as to press against the lamp-globe.

iJnite States Patent Halonen [151 3,657,538 [4 1 Apr. 1, 1972 [54] REFLECTOR FOR ELECTRIC LAMPS [72] Inventor: Eero Halonen, Ulvilantie 10 A 14, Helsinki 35, Finland [22] Filed: June 26, 1970 211 Appl. No.: 50,020

[52] U.S. CI ..240/104, 240/109,'240/138 [51] Int. Cl. .L ..F21v 7/00 [58] Field of Search ..240/l04, 106, 109,138, 128

[56] References Cited UNITED STATES PATENTS 1,384,395 7/1921 McFaddin ..240/l38 2,126,650 8/1938 Matera ..240/1 38 X 2,629,046 2/1953 Liberman ..240/138X FOREIGN PATENTS OR APPLICATIONS 1,096,385 12/1967 Great Britain ..240/138 Primary Examiner-Richard C. Queisser Assistant Examiner-John P. Beauchamp Attorney-Woodling, Krost, Granger & Rust [5 7] ABSTRACT Reflector for electric lamps. The reflector comprises a part of aluminum plate of the shape of a truncate ball segment, and in connection with it a part of the shape of a paraboloid, and which is provided with one or several elastic fixing means for fixing the reflector detachably to the lamp-globe. One or several nail-like projections are pressed into the reflector, through which one end of a spring serving as fixing means is brought, while the other end protrudes from the inside surface of the reflector, so as to press against the lamp-globe.

3 Claims, 4 Drawing Figures REFLECTOR FOR ELECTRIC LAMPS This invention concerns a reflector for electric lamps comprising a part of aluminum plate with the shape of a truncate ball segment, and in connection with it a part of the shape of a paraboloid, and which is provided with one or several elastic fixing means for fixing the reflector detachably to the lampglobe.

Reflectors of the type presented above are known where a holder is fastened to a ring-shaped flange formed at the narrower end of the reflector, from which holder two ring-shaped branches extend toward the wider end of the reflector. These branches are made in one piece with the holder, are situated at a distance opposite one another, and are resilient so as to pinch about the lamp-globe. However, a reflector of this kind is comparatively complicated both in construction and manufacture.

Reflectors are also known where radial strips are stamped into the narrower end, which thanks to their flexible nature press against the lamp-globe. The fact that the strips have to retain their flexibility as the globes repeatedly are changed, puts restrictions to the material of the reflectors.

In one known reflector unelastic or elastic supporting means are fastened to the inside surface of its narrower part, which are fastened by gluing to the surface of the lamp-globe. This construction has the marked disadvantage that always when a lamp-globe is changed the previous glued joint has to be removed and a new joint made, which is inconvenient and time consuming.

The object of this invention is to eliminate the above disadvantages and this is accomplished by the reflector according to the invention, the essential characteristic feature of which is that one of several claw-like projections are punched into the reflector, through which one end of a spring serving as fixing means is brought, while the other end is sticking out from the inside surface of the reflector, so as to press against the lampglobe.

As to construction and manufacture the reflector according to the invention is most simple. Likewise one or several ordinary plate springs, or springs bent to V-shape, which last can be placed into their respective holders, may be used for keeping the reflector in its place.

The invention is explained further in the specification below and in the enclosed schematical drawing, in which FIG. 1 presents a longitudinal section of the reflector according to the invention connected to the electric globe,

FIG. 2 presents a section taken over the line 11-11 in FIG. 1 in the direction of the arrows,

FIG. 3 presents in the same way as FIG. 1 a part of a reflector according to a second mode of application, and

FIG. 4 presents in the same way as FIGS. 1 and 2 a part of a reflector according a third mode of application.

According to the drawing, in the figures of which the same and corresponding parts are designated by the same numbers, the reflector 1 comprises a part 2 of the shape of a truncate ball segment, and a part 3 of the shape of a paraboloid connected to it. The reflector is preferably made of thin, anodized aluminum foil to give a light, and if desired a colored reflector with good refiectibility.

The lower part of the ball-shaped part 2 is provided with a claw-like projection or a holder 4 by pressing outwards, and at the connecting point between the ball-shaped part 2 and the paroboloid-shaped part 3 with a hole 5 in FIG. 1 situated in the vertical plane at the projection 4. One end of the plate spring 6 is threaded through the projection 4 and the hole 5, which is provided, for instance, with a dilatation 7 or the like of epoxy resin, tin, or similar material, in order to keep the spring in position. The part of the plate spring extending inside of the reflector projects from the inner surface of the reflector and is bent towards the axis of the reflector. The bending point is situated at the hole 5 in the reflector, and the spring portion extending from hereinto the reflector is straight, but it may also be curved to follow the lamp-globe.

When the reflector 1 is fitted to position about the lampglobe 8 according to FIG. 1, the plate spring 6 presses the lamp-globe 8 from the opposite'side against the inside surface of the ball-shaped part 2 of the reflector, so that the reflector keeps well in its place and cannot rise to contact the socket 9 of the bulb. When the reflector is suspended vertically, one plate spring 6 is sufficient to keep the reflector in horizontal position. Again, if the reflector l is in oblique position one or several springs is needed depending on the size and shape of the reflector. The plate spring 6 also may extend so far along the lamp-globe 8, that a mirror can be arranged below it.

In order to leave a ring-shaped air-space between the reflector l and the lamp-globe 8, a few depressions (not presented) may be made into the inner surface of the ball-shaped part 2 of the reflector, on which the lamp-globe 8 may rest. In this case the projection 4 may be advantageously pressed into the inner surface of the ball-shaped part 2 so that the plate spring does not have to be brought through the reflector.

In the mode of application according to FIG. 3 the reflector is provided with a V-shaped spring 10. Then the projection is pressed into the exterior surface of the paraboloidal part 3, through which one branch 11 of the spring 10 is passing, which is provided with a dilatation or a knot 7, while the other branch 12 of the spring 110 is brought through the hole 5 at the connecting point between the ball-shaped part 2 and the paraboloidal part 3 to the inside of the reflector, to protrude from the inside surface of the reflector and to rest against the lamp-globe 8. The branches 11 and 12 of the spring 10 may be straight or bent to follow the surface of the lamp-globe. Also in this mode of application there may be several springs, and depressions may be made into the inner surface of the ballspacedpart 2 of the reflector (not presented).

The mode of application according to FIG. 4 is otherwise similar to that presented in FIG. 3, except that the projection 41 is pressed into the inside surface of the paraboloidal part 3. Then the branch 12 of the spring 10 resting against the lampglobe 8 does not have to go through the reflector l at all.

In all modes of application presented the reflector II can equally well be arranged in upside-down position compared to that presented in Flg. l.

The reflector according to the invention is preferably manufactured from about 0.2 0.8 mm thick aluminum plate. After the claw-like projection 4 is pressed into the reflector, the upper end of the plate spring 6 bent to an angle is threaded by way of the hole 5 through the projection, and a drop of epoxy resin, tin, or such material, is brought to stick to the end of the plate spring in FIG. 1, reaching upward from this projection, so that a dilatation or a knot 7 is formed. In corresponding manner the other branch 1 1 or 12 of the V-shaped spring 10 in the modes of application according to FIGS. 3 and 4 is threaded through the claw-like projection 4 and epoxy resin or tin is brought to stick to the end of that branch which is going through the projection, so that a dilatation or knot 7 is formed. Thanks to such dilatation the spring stays securely in place and does not strain the claw-like projection 4 as the spring is pressing against the lamp-globe, while the reflector can be made of very thin plate material.

The invention naturally is not restricted to the above presented modes of application chosen as examples, but may be varied considerably within the scope of the patent claims.

7 Thus the shape of the cross-section of the spring may vary, for

example it may be round, i.e. a spring thread is used as spring. Likewise the length of the spring touching the globe may be varied considerably.

I claim:

1. A reflector for electric lamps comprising a member having a portion of the shape of a truncate ball segment (2) and another portion in connection therewith of the shape of a paraboloid (3), said member having at least one elastic fixing means for fixing the reflector detachably to the lamp-globe (8), said elastic fixing means including at least one nail-like projection (4) pressed into said member, a generally V-shaped spring (6,10) extends through said nail-likeprojection, one end of said generally V-shaped spring serves to fix the spring in place and another end of the spring protrudes from the inside surface of the reflector so as to press against the lampglobe (8).

2. Reflector as claimed in claim 1, characterized in that the nail-like projection (4) is pressed into the outer surface of the paraboloidal part (3) of the reflector, and that one branch (11) of the V-shaped spring (10) passes through the projection (4), and the other branch (12) is brought through a hole at the point of connection between the ball-shaped part (2) and the paraboloidal part (3) to the inside of the reflector, so as to extend from its interior surface and press against the lamp-globe.

3. Reflector as claimed in claim 1, characterized in that the projection (4) is pressed into the interior surface of the paraboloidal part (3) of the reflector, and that one branch (11) of the V-shaped spring (10) passes through the projection (4) and the other branch (12) protrudes from the interior surface of the reflector, so as to bring it to press against the lamp-globe (8). 

1. A reflector for electric lamps comprising a member having a portion of the shape of a truncate ball segment (2) and another portion in connection therewith of the shape of a paraboloid (3), said member having at least one elastic fixing means for fixing the reflector detachably to the lamp-globe (8), said elastic fixing means including at least one nail-like projection (4) pressed into said member, a generally V-shaped spring (6,10) extends through said nail-like projection, one end of said generally V-shaped spring serves to fix the spring in place and another end of the spring protrudes from the inside surface of the reflector so as to press against the lamp-globe (8).
 2. Reflector as claimed in claim 1, characterized in that the nail-like projection (4) is pressed into the outer surface of the paraboloidal part (3) of the reflector, and that one branch (11) of the V-shaped spring (10) passes through the projection (4), and the other branch (12) is brought through a hole (5) at the point of connection between the ball-shaped part (2) and the paraboloidal part (3) to the inside of the reflector, so as to extend from its interior surface and press against the lamp-globe.
 3. Reflector as claimed in claim 1, characterized in that the projection (4) is pressed into the interior surface of the paraboloidal part (3) of the reflector, and that one branch (11) of the V-shaped spring (10) passes through the projection (4) and the other branch (12) protrudes from the interior surface of the reflector, so as to bring it to press against the lamp-globe (8). 